KR101944375B1 - Lens unit for display - Google Patents

Abstract

An embodiment relates to a lamp unit for a display, comprising: a light source; a substrate on which the light source is disposed; a lens disposed on an upper part of the light source; and a panel disposed on a lower part of the substrate. The lens comprises: a lens part disposed on a light emitting line of the light source; and a first fixing part protruding from the lens part, wherein an end part of the first fixing part penetrating the substrate may be disposed in a groove formed in the panel. Therefore, interference by a hook during assembly can be prevented and an effect of heat radiation can be increased by using a hook structure formed on the lens to fix the lens to the substrate and to realize a concavo-convex structure by the groove.

Description

A lamp unit for a display (LENS UNIT FOR DISPLAY)

An embodiment relates to a lamp unit for a display. And more particularly, to a lamp unit for a display having a lens capable of closely adhering a substrate provided with a light source to a panel while minimizing thermal influence of the light source using a hook.

Recently, demand for flat panel display devices, which have been improved in size and weight and have improved performance, has been explosively increasing, centering on semiconductor technology which is rapidly developing.

Among these flat panel displays, liquid crystal displays (LCDs), which have been popular in recent years, have advantages such as miniaturization, light weight, and low power consumption, which can overcome the drawbacks of conventional cathode ray tubes Has been gradually attracting attention as an alternative means, and is currently used in almost all information processing devices requiring a display device.

Since the liquid crystal display panel in the liquid crystal display device is a light receiving element that can not emit light by itself, the backlight unit is provided below the liquid crystal display panel to provide light to the liquid crystal display panel. The backlight unit includes a lamp, a light guide plate, a reflective sheet, an optical sheet, and the like. The lamp has a relatively low calorific value and emits white light close to natural light, and has a long lifespan, a cold cathode fluorescent tube type lamp, a LED type lamp using a light emitting diode (hereinafter referred to as "LED") with good color reproducibility and low power consumption Lt; / RTI > The LED type lamp has advantages of good color reproducibility and low power consumption.

However, even in the case of an LED type lamp, heat is generated, and a problem is that a lens, which is bonded by an adhesive member such as a bond or an adhesive tape, is detached from the lamp by the heat.

Accordingly, there is a demand for a lamp unit that can fix a substrate to a panel while being fixed to the substrate without using an adhesive member.

Embodiments provide a display lamp unit capable of fixing a lens to a substrate using a hook structure formed on a lens or bringing a substrate on which a lens is mounted into close contact with a metal-made panel.

Also, a display lamp unit is provided which is capable of preventing assembling interference by hooks and increasing heat radiation effect by forming grooves in the panel to realize a concave-convex structure.

The problems to be solved by this embodiment are not limited to the above-mentioned problems, and other problems not mentioned here can be understood by those skilled in the art from the following description.

According to an embodiment of the present invention, A substrate on which the light source is disposed; A lens disposed on the light source; And a panel disposed at a lower portion of the substrate, wherein the lens comprises: a lens portion disposed on a light irradiation line of the light source; And a first fixing part protruding from the lens part, wherein an end of the first fixing part passing through the substrate is disposed in a groove formed in the panel.

Here, the panel may include a support portion that is in contact with one region of the substrate on which the light source is disposed; And a pair of the grooves disposed with the support portion interposed therebetween, wherein the grooves may be formed from one side edge to the other edge side of the panel.

The first fixing portion includes a base protruding from a lower portion of the lens portion; And a first hook portion protruding downward from one region of the base, wherein the first contact surface of the base contacts the upper surface of the substrate, and the first contact portion of the first hook portion formed at a first height different from the first contact surface 2 contact surface can contact the lower surface of the substrate.

The lens may further include a second fixing part protruded from the lens part in the same direction as the first fixing part to bring the panel into close contact with the lower surface of the substrate.

The protrusion height of the first fixing part may be smaller than the protrusion height of the second fixing part.

The end of the second fixing part formed in a hook shape may be disposed in a cavity formed between the grooves.

The panel may further include ribs protruding from a lower surface of the panel, and the ribs disposed in the cavity may be formed in an S shape.

The lamp unit for a display according to an embodiment may fix the lens to the substrate using a hook structure formed on the lens or may adhere the substrate on which the lens is mounted to a metal panel.

Also, the display lamp unit may have grooves formed in the panel to realize the concavo-convex structure, thereby preventing the assembly interference by the hook and increasing the heat radiating effect.

Further, the display lamp unit can improve heat radiation effect while securing rigidity by using ribs. Furthermore, the rib can protect the end of the second fixing part.

1 and 2 are a perspective view and an exploded perspective view showing a display lamp unit according to the first embodiment,
3 is a front view showing a display lamp unit according to the first embodiment,
4 and 5 are a bottom perspective view and a front view showing the lens of the display lamp unit according to the first embodiment,
6 and 7 are a perspective view and an exploded perspective view showing a display lamp unit according to the second embodiment,
8 is a front view showing the display lamp unit according to the second embodiment,
9 and 10 are a bottom perspective view and a front view showing the lens of the display lamp unit according to the second embodiment,
11 is a bottom perspective view of the display lamp unit according to the second embodiment in which the ribs are arranged,
12 is a plan view of the display lamp unit according to the second embodiment in which ribs are arranged.

The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated and described in the drawings. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms including ordinal, such as second, first, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the second component may be referred to as a first component, and similarly, the first component may also be referred to as a second component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

In the description of the embodiments, when an element is described as being formed "on or under" another element, the upper or lower (lower) (on or under) all include that the two components are in direct contact with each other or that one or more other components are indirectly formed between the two components. Also, when expressed as 'on or under', it may include not only an upward direction but also a downward direction based on one component.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and redundant description thereof will be omitted.

The display lamp unit (1, 1a) according to the embodiment can irradiate light toward the liquid crystal display panel (2). At this time, the liquid crystal display panel 2 may be disposed on the light irradiation line of the display lamp unit 1, 1a.

At this time, the display lamp unit (1, 1a) fixes a lens for diffusing light using a hook structure to a substrate or a panel, excluding a conventional adhesive member. Accordingly, conventionally, the application and adhesion of the adhesive member to the lens and the curing process of the adhesive member are eliminated, thereby simplifying the assembling process and eliminating the difference in performance due to this, thereby improving the productivity.

1st Example

1 and 2 are a perspective view and an exploded perspective view showing a display lamp unit according to a first embodiment, Fig. 3 is a front view showing a display lamp unit according to the first embodiment, Fig. 4 and Fig. 1 is a bottom perspective view and a front view showing a lens of a display lamp unit according to an embodiment.

1 to 3, the display lamp unit 1 according to the first embodiment includes a light source 100, a substrate 200 on which the light source 100 is disposed, A lens 300 and a panel 400 disposed under the substrate 200.

The light source 100 irradiates light toward the lens 200. Then, the light can be irradiated to the liquid crystal display panel 2 through the lens 300.

Here, the light source 100 may be an LED. The LED may be coated with a yellow phosphor.

The substrate 200 may be formed in a plate shape. At this time, the substrate 200 may be provided as a flexible circuit board on which wiring circuit lines are arranged. But is not necessarily limited thereto.

The substrate 200 may include an upper surface 210, a lower surface 220, and a first hole 230, as shown in FIG. In this case, 'upper' and 'lower' are relative expressions. The direction from the lower surface 220 to the upper surface 210 is defined as the upper side (upper and upper side), while the upper surface 311 to the lower surface 312 The lower side (lower side, lower side).

The light source 100 may be disposed on the upper surface 210 of the substrate 200, as shown in FIG. The panel 400 may be disposed on the lower side of the substrate 200. At this time, one area of the panel 400 may be in contact with the lower surface 220 of the substrate 200.

The lens 300 can diffuse the light emitted from the light source 100. At this time, the lens 300 may be formed of a glass material or a polymer material (PC, PMMA).

The lens 300 may include a lens portion 310 and a plurality of first fixing portions 320. Here, the lens portion 310 and the first fixing portion 320 may be integrally formed.

The lens unit 310 may be disposed on the light irradiation line of the light source 100 to diffuse the light emitted from the light source 100.

Referring to FIG. 4, the lens unit 310 may include a lower surface 312 and an incident surface 313 of the upper surface 311.

The top surface 311 may be formed such that the uppermost center portion thereof is depressed downward. As shown in Figs. 1 and 2, the upper surface 311 may be formed such that the central portion thereof is concave in the optical axis direction (z direction). Here, the optical axis is the center of the light emitted from the light source 100, and may be coincident with the center of the lens unit 310.

Although the upper surface 311 is formed in a shape in which the uppermost central portion is recessed downward, the upper surface 311 is not necessarily limited to this, and the upper surface 311 may be formed to be convex toward the upper side.

Accordingly, a part of the light incident on the lens portion 310 through the incident surface 313 is emitted through the upper surface 311.

At this time, the upper surface 311 may be formed into a hemispherical shape or an asymmetric hemispherical shape when viewed from above.

The lower surface 312 may be a curved surface having a predetermined curvature. At this time, the lower surface 312 may have a downward convex shape or a planar shape.

The incident surface 313 may be a surface portion where light emitted from the light source 100 is incident on the inside of the lens unit 310. Thus, the light source 100 may be disposed on the substrate 200 to illuminate the incident surface 313 with light.

The incident surface 313 may be recessed from the center of the lower surface 312 toward the upper surface 311. At this time, the incident surface 313 may be provided as a groove whose vertical cross section is semi-elliptical or parabolic.

Therefore, since the air layer is disposed between the light source 100 and the incident surface 313, the light emitted from the light source 100 to the air layer can be refracted by the incident surface 313 having a different refractive index. Accordingly, the light emitted from the light source 100 can be diffused through the lens unit 310.

The first fixing part 320 may protrude downward from the lens part 310. The end of the first fixing part 320 may penetrate through the substrate 200. For example, one region of the first fixing portion 320 may be disposed in the groove 420 of the panel 400 through the first hole 230 of the substrate 200.

At this time, the end of the first fixing part 320 may be formed into a hook shape. Accordingly, the first fixing part 320 fixes the lens part 310 to the substrate 200. That is, as the first fixing portion 320 is coupled to the substrate 200, the lens 300 is fixed to the substrate 200.

Referring to FIG. 4, the first fixing portion 320 may include a first base 321 and a first hook portion 322. At this time, the first base 321 may be disposed between the lens portion 310 and the first hook portion 322.

The first base 321 may protrude downward from the lower surface 312 of the lens unit 310. 4, the first hook portion 322 may protrude downward from one region of the first base 321. Accordingly, the first contact surface 321a may be formed under the base 321. [ Here, the first contact surface 321a may be provided as a stepped surface formed by protruding the first hook portion 322 in one region of the base 321. [

The first contact surface 321a may be in contact with the upper surface 210 of the substrate 200 and be supported on the substrate 200 when the first fixing unit 320 is coupled to the substrate 200. [

At this time, since the first base 321 of the first fixing part 320 is formed to have a predetermined thickness, the substrate 200 and the lens part 310 are spaced apart from each other by a predetermined distance. That is, the first base 321 allows the lower surface 312 of the lens unit 310 and the upper surface 210 of the substrate 200 to be arranged at predetermined intervals.

Meanwhile, the first hook portion 322 may be formed in a hook shape.

As shown in FIG. 4, the first hook portion 322 may include a second contact surface 322a. At this time, the second contact surface 322a may be formed at a first height d1 different from the first contact surface 321a.

The second contact surface 322a of the first hook portion 322 passing through the first hole 230 of the substrate 200 is brought into contact with the lower surface 220 of the substrate 200. [ Accordingly, the upper surface 210 of the substrate 200 is brought into close contact with the first contact surface 321a. Here, the second contact surface 322a may be provided as an engagement surface formed at an end of the first hook portion 322. [

Therefore, the lens 300 can be fixed to the substrate 200 by the first fixing part 320 having a hook shape. Specifically, since the substrate 200 is disposed between the first contact surface 321a and the second contact surface 322a, the lens 300 can be fixed to the substrate 200. [

The panel 400 may be disposed under the substrate 200. At this time, the panel 400 may be formed of a metal material. Accordingly, the heat transmitted to the panel 400 through the substrate 200 can be rapidly conducted on the panel 400. [

The panel 400 may include a support 410 and a groove 420. Here, the groove 420 may be formed by bending a region of the panel 400 formed in a plate shape using a pressing device (not shown) so as to protrude downward (downward). As shown in FIG. 2, the pair of grooves 420 may be formed apart from each other, so that the support portion 410 may be formed between the grooves 420.

Accordingly, the panel 400 can realize a concave-convex structure.

The supporting part 410 may be disposed in contact with the lower surface 220 of one area of the substrate 200 on which the light source 100 is disposed. At this time, the support portion 410 may be formed in a plate shape. Accordingly, most of the heat generated in the light source 100 can be conducted to the support portion 410 through the substrate 200. [

Further, a heat transfer member (not shown) such as a thermal pad or a thermal grease may be disposed between one region of the substrate 200 and the support portion 410. Here, the heat transfer member may be disposed only in one region of the region where the substrate 200 and the support portion 410 are in contact with each other. In particular, the heat transfer member may be disposed only in a region of the contact region that overlaps with the light source 100 on a plane. An adhesive member (not shown) such as a bond may be disposed in a remaining area of the contact area or a part of the remaining area to improve the fixing force. Since the heat is transmitted to the panel 400 by the heat transfer member, the influence of the adhesive member due to heat can be minimized.

The groove 420 may be concave downward with respect to the support portion 410. As shown in FIG. 2, the panel 400 may be formed long in the width direction (y direction) from one side edge to the other edge side, but is not limited thereto. For example, in consideration of the position of the first fixing part 320, it may be formed long in the longitudinal direction (x direction).

The groove 420 is formed to extend in a width direction (y direction) from one side edge of the panel 400 to the other edge side, so that the groove 420 can serve as a channel through which air can move. Accordingly, the heat of the substrate 200 can be cooled through the groove 420.

In addition, the groove 420 can increase the surface area where the heat conducted to the support portion 410 can be dissipated, thereby improving the heat dissipation effect. At this time, a pair of spaced apart members are disposed to form the concave-convex structure on the panel, so that the heat dissipation effect for the support portion 410 is further increased.

3, an end portion of the first hook portion 322 of the first fixing portion 320 penetrating through the substrate 200 may be disposed on the groove 420. Accordingly, the end of the first hook portion 322 can be protected from an external force such as an impact caused by the impact.

For example, a portion of the first hook portion 322 relative to the second contact surface 322a is disposed in the groove. Accordingly, it is possible to prevent the assembly interference by the first hook portion 322, which may occur when the display lamp unit 1 is assembled to the display device.

The display lamp unit 1 has a structure in which the lens 300 is fixed to the substrate 200 through the hook structure and the hook is protected by using the concave and convex structure through the groove 420, .

Second Example

6 and 7 are a perspective view and an exploded perspective view showing the display lamp unit according to the second embodiment, Fig. 8 is a front view showing the display lamp unit according to the second embodiment, Fig. 9 and Fig. 1 is a bottom perspective view and a front view showing a lens of a display lamp unit according to an embodiment.

6 to 10, in the description of the display lamp unit 1a according to the second embodiment, the same components as those of the display lamp unit 1 according to the first embodiment are denoted by the same reference numerals A detailed description thereof will be omitted.

The display lamp unit 1a according to the second embodiment includes a light source 100, a substrate 200a on which the light source 100 is disposed, a lens 300a disposed on the upper portion of the light source 100, And a panel 400a disposed at the lower portion.

Referring to FIG. 7, the substrate 200a may include an upper surface 210, a lower surface 220, a first hole 230, and a second hole 240. Here, the second fixing part 330 of the lens 300a may be arranged to penetrate through the second hole 240.

The lens 300a can diffuse the light emitted from the light source 100. [

The lens 300a may include a lens portion 310, a plurality of first fixing portions 320, and a plurality of second fixing portions 330. [ Here, the lens unit 310, the first fixing unit 320, and the second fixing unit 330 may be integrally formed.

The second fixing part 330 may protrude downward from the lens part 310. At this time, the second fixing part 330 may protrude in the same direction as the first fixing part 320. Here, the projection height of the first fixing portion 320 is smaller than the projection height of the second fixing portion with respect to the lens portion 310 (see FIG. 9). The protruding height H2 of the second fixing part is larger than the protruding height H1 of the first fixing part 320 with reference to the lower surface 220 of the substrate 200a as shown in FIG.

The end of the second fixing part 330 may penetrate through the substrate 200a. For example, one region of the second fixing portion 330 is disposed in the cavity 440 of the panel 400a through the second hole 240 of the substrate 200a and the third hole 430 of the panel 400a .

At this time, the end of the second fixing part 330 may be formed into a hook shape. The second fixing part 330 fixes the lens part 310 to the substrate 200a and makes the panel 400a closely contact with the substrate 200a. That is, as the second fixing portion 330 is coupled to the substrate 200a and the panel 400a, the lens 300a is fixed to the substrate 200a and the panel 400a.

Referring to FIG. 10, the second fixing portion 330 may include a second base 331 and a second hook portion 332. At this time, the second base 331 may be disposed between the lens portion 310 and the second hook portion 332.

The second base 331 may protrude downward from the lower surface 312 of the lens unit 310. 10, the second hook 332 may protrude downward from one region of the second base 331. In addition, Accordingly, the first contact surface 331a may be formed under the base 321. [ Here, the first contact surface 331a may be provided as a stepped surface formed by protruding the second hook portion 332 in one region of the base 321. [

Therefore, when the second fixing part 330 is coupled to the substrate 200a, the first contact surface 331a can be held in contact with the upper surface 210 of the substrate 200a to be supported on the substrate 200a.

At this time, since the second base 331 of the second fixing part 330 is formed to have a predetermined thickness, the substrate 200a and the lens part 310 are spaced apart from each other by a predetermined distance. That is, the second base 331 allows the lower surface 312 of the lens unit 310 and the upper surface 210 of the substrate 200a to be arranged at predetermined intervals.

On the other hand, the end of the second hook portion 332 may be formed into a hook shape.

10, the second hook portion 332 may include a second contact surface 322a. At this time, the second contact surface 322a may be formed at a second height d2 different from the first contact surface 331a. The second height d2 is greater than the first height d1.

The second contact surface 322a of the second hook portion 332 penetrating the second hole 240 of the substrate 200a is brought into contact with the lower surface of the panel 400a. The upper surface 210 of the substrate 200a is brought into close contact with the first contact surface 331a of the second base 331. [ Here, the second contact surface 322a may be provided as an engagement surface formed at an end of the second hook portion 332. [

Therefore, the lens 300a is fixed to the substrate 200a by the second fixing part 330 having a hook shape, and at the same time, the panel 400a is brought into close contact with the lower part of the substrate 200a. In detail, since the substrate 200a and the panel 400a are disposed between the first contact surface 331a and the second contact surface 322a, the lens 300a is fixed to the substrate 200a, And is brought into close contact with the lower portion of the substrate 200a.

The lens 300a and the substrate 200a are coupled by the first fixing part 320 of the lens 300a to the first fixing part 330 of the lens 300a by the second fixing part 330 of the lens 300a, 400a are coupled to each other.

The panel 400a may be disposed below the substrate 200a.

The panel 400a may include a support 410, a groove 420, a third hole 430, and a cavity 440. Here, the groove 420 may be formed by bending one area of the panel 400a formed in a plate shape using a pressing device (not shown) so as to protrude downward (downward). 7, by forming the pair of grooves 420 apart from each other, the support portion 410 can be formed between the grooves 420. [

Accordingly, the panel 400a can realize a concave-convex structure. Accordingly, as shown in FIGS. 7 and 8, a cavity 440 may be formed between the grooves 420.

That is, the support portion 410 is disposed between the pair of grooves 420, and the cavity 440 may be formed between the grooves 420 by the height difference between the support portion 410 and the groove 420.

The third hole 430 may be formed in the support 410.

Referring to FIG. 8, the end of the second hook portion 332 of the second fixing portion 330 penetrating the substrate 200a may be disposed in the cavity 440. The protrusion height H2 of the second fixing part 330 may be smaller than the protrusion height H3 of the groove 420 with respect to the lower surface 220 of the substrate 200a. As a result, the end of the second hook portion 332 can be protected from an external force such as an impact caused by a collision.

For example, a portion of the second hook portion 332 is disposed in the cavity 440 with respect to the second contact surface 322a. Accordingly, it is possible to prevent the assembly interference by the second hook portion 332, which may occur when the display lamp unit 1a is assembled to a display device such as a flat panel display.

FIG. 11 is a bottom perspective view of a display lamp unit according to a second embodiment in which ribs are arranged, and FIG. 12 is a plan view of a display lamp unit according to a second embodiment in which ribs are arranged.

11 to 12, the display lamp unit 1a may further include a rib 450 disposed at a lower portion of the support unit 410. Referring to FIG. Here, the ribs 450 are disposed on the display lamp unit 1a according to the second embodiment, but the present invention is not limited thereto. The ribs 450 may be formed on the support part of the display lamp unit 1 according to the first embodiment, (Not shown).

The ribs 450 may protrude downward from the lower surface of the support portion 410 of the panel 400a. For example, the ribs 450 may be disposed in the cavity 440.

At this time, the rib 450 is formed of a metal material and may be integrally formed with the support portion 410.

Accordingly, the rib 450 can secure the rigidity of the support portion 410. In addition, since the rib 450 is formed of a metal material, the heat generated from the light source 100 is conducted to the rib 450 through the support portion 410 and is then discharged to the outside.

The ribs 450 may be formed in an S shape. Accordingly, the heat dissipating area of the rib 450 is enlarged to improve the amount of heat dissipation.

As shown in FIGS. 11 and 12, one end and the other end of the planar ribs 450 may be formed to have a predetermined curvature. As viewed from below, the ends of the second hook portions 332 are disposed inside each of the ends of the ribs 450 and can be protected by external force.

As shown in FIG. 12, one region of the rib 450 may be disposed on the plane overlapping the light source 100. Accordingly, the heat dissipation performance by the rib 450 can be further improved.

The protrusion height of the rib 450 may be equal to the protrusion height H3 of the groove 420 with respect to the lower surface of the panel 400a. As a result, the end of the second hook portion 332 can be protected from an external force such as an impact caused by a collision.

The display lamp unit 1a has a structure in which the substrate 200a is closely attached to the metal panel 400a through the hook structure and the hook structure is protected through the groove 420 and the cavity 440 The heat radiating effect can be increased.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the appended claims. It will be understood that the present invention can be changed. It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

1: Lamp unit for display
100: Light source
200, 200a: substrate
300, 300a: lens
320: first fixing part 320: second fixing part
400, 400a: panel
410: Support part 420: Groove
430: Third hole 440: Cavity
450: rib

Claims (7)

Light source;
A substrate on which the light source is disposed;
A lens disposed on the light source; And
And a panel disposed below the substrate,
The lens
A lens unit disposed on a light irradiation line of the light source;
A first fixing part protruding from the lens part; And
And a second fixing part protruding from the lens part in the same direction as the first fixing part to bring the panel into close contact with the lower surface of the substrate,
An end of the first fixing part penetrating through the substrate is disposed in a groove formed in the panel,
And an end of the second fixing part formed in a hook shape is disposed in a cavity formed between the grooves. The method according to claim 1,
The panel
A support portion contacting a region of the substrate on which the light source is disposed; And
And a pair of the grooves disposed with the support portion interposed therebetween,
Wherein the groove is formed from one side edge to the other edge of the panel. 3. The method of claim 2,
The first fixing portion
A base protruding from a lower portion of the lens unit; And
And a first hook portion protruding downward from one region of the base,
The first contact surface of the base contacts the upper surface of the substrate,
And a second contact surface of the first hook portion formed at a first height different from the first contact surface is in contact with a lower surface of the substrate. delete The method according to claim 1,
Wherein the projection height of the first fixing portion is smaller than the projection height of the second fixing portion. delete The method according to claim 1,
And a rib protruding from a lower surface of the panel,
And the ribs disposed in the cavity are formed in an S-shape.

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